Speed-changing attachment for tachometers.



No. 819,695. PATENTED MAY l, 1906. A. FRICKER.

SPEED CHANGING ATTACHMENT POR TAGHOMETBRS. APPLIGATION FILED ocT.z3.1905.

UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Batented May 1, 1906.

Application filed October 25, 1905. Serial No. 284.085.

To all whom, t may concern.-

Be it known that I, ANTHONY FRICKER, a citizen of the United States ofAmerica, residing at Pittsburg, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inSpeed- Changing Attachments for Tachometers, of which the following is aspecification, reference being had therein to the accompanying drawings.

This invention relates to certain new and useful improvements inspeed-changing attachments for tachometers; and the invention has forits primary object to increase the efficiency of a tachometer.

The invention aims to provide a novel attachment for tachometers whichwill increase or decrease the different speeds to be determined by thetachometer. To this end I have devised an attachment embodying a casingin which a loose hub is mounted, and pivotally mounted upon the hub is abeveled gear-wheel adapted to mesh with a fixed beveled gear and a loosebeveled gear carried by a shaft that extends out of the casing.

The above construction will behereinafter more fully described andclaimed, and, referring to the drawings accompanying this application,like numerals of reference designating corresponding parts throughoutthe several views, in which- Figure 1 is a plan of a tachometer, partlybroken away. Fig. 2 is a central vertical section of the same,illustrating my improved attachment in connection therewith. Fig. 3 is alongitudinal sectional view of the attachment. Fig. 4 is across-sectional view taken on the line a: of Fig. 3 looking in thedirection of the loose hub. Fig. 5 is a similar view taken on the sameline of Fig. 3 looking in the direction of the xed beveled gear. Fig. 6is a longitudinal sectional view of a frictionwheel used in connectionwith the attachment. Fig. 7 is a vertical sectional view of the loosehub.

In the accompanying drawings I have illustrated my improved attachmentas used in connection with a conventional form of tachometer, such asillustrated, described, and claimed in Patent No. 7 28,529, under dateof May 19,1903.

The essential features of the tachometer consist of a casing 1, in whichis mounted a graduated dial 2. Revolubly mounted above said dial is arotary fan-wheel 3 and spanning said wheel is a pointer-vane 4, which isadapted to indicate upon the graduated dial 2 the speed at which therotary fan-wheel revolves. In the side of the casing 1 is mounted atubular stub shaft 5, which when revolved is` adapted to impart a rotarymovement to the fan-wheel 3 through the medium of gears 6 and 7 andpinions 8, 9, 10, and 11. In connection with the rotary fan 2 aninertia-brake 12 is used, and it is thought from the above description,in connection with the drawings, that the operation of the tachometerwill be apparent without further description.

My invention resides in the attachment illustrated in Figs. 2 to 7,inclusive, and in Fig. 2 of the drawings I have illustrated theattachment in position to actuate the tachometer. The attachmentembodies two heads 14 and 15,the head 15 being formedintegral with orcarrying a cylindrical exteriorly-knurled casing 16. The interior .wallof the head 15 is provided with a xed beveled gear 17, and centrally ofsaid gear and the head 15 is formed an aperture or opening 18. Extendingthrough said opening or aperture is a stub-shaft 19, upon which is fixeda hub 20, and the opposite face of the hub is provided with acylindrical recess 21, adapted to oigizontally aline with the shaft 19of said The one face of the hub is cut away, as at 22, and pivotallymounted upon the face of the hub by a pin or stub shaft 23 is a beveledgear-wheel 24. The hub diametrically opposite the beveled gear-wheel is'recessed, as at 25, to counterbalance the beveled gear-wheel 24. The hubis provided with a peripheral groove 26 to facilitate a lubricant placedwithin the casing 16 in reaching the beveled gear-wheel 24.

The head 14 is provided with a central opening, through which extends ashaft 27, and carried by said shaft within the casing 16 is a beveledgear-wheel 28. i the shaft 27 is contracted, as at 29, to extend intothe cylindrical recess 21 of the hub and assist in supporting the hub inthe casing 16. The head 14 is secured to the cylindrical casing 16 byscrews 30. In Fig. 6 of the drawings the cone-shaped friction-wheel 31is carried by a sleeve 82, and this sleeve is adapted to fit over eitherone of the stub-shafts 27 or 19 when it is desired to use the attachmentin connection with a tachometer.

When it is desired to use the attachment, the sleeve 32 is placed uponone of the shafts 27 or 19 and the other of said shafts inserted The oneend of.

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in the tubular stub-shaft 5 of the tachometer. (Illustrated in Figs. 1and 2 of the drawings.) The cone-shaped friction-Wheel 31 is then placedin engagement With the center of the end of a shaft or aXle the speed ofWhich is to be ascertainedby the tachometer. When the Wheel 31 and theshaft 27 revolve, the shaft 19, Which is connected. to the tachometer,Will revolve one-half as fast as the shaft 27, the revolutions of theshaft 19 being reduced through the medium of the beveled gears 28 and 17and the beveled gear-Wheel 24. Consequently one-half the number ofrevolutions made by the shaft or a'Xle being tested Will be indicatedupon the dial 2 of the tachometer. By reversing the tachometer andplacing the shaft 27 1n the cylindrical stub-shalt 5 and placing thesleeve 32 upon the shaft 19 and holding it in engagement .With the shaft0r axle to be tested twice the number of revolutions of said shaft oraxle Will be indicated by the pointer-vane 4 upon the dial 2. f

It is thought from the foregoing that the construction, operation, andadvantages of the herein-described speed-changing attachment Will beapparent Without further description, and various changes in the form,proportion, andfminor details of construction may be resorted to Withoutdeparting from the spirit of the invention or sacrificing any of theJadvantages thereof.

What I claim, and desire to secure by Leti ters Patent, is-

1. The combination in a tachometer, of a reversible attachmentcomprising a casing, beveled gears mounted in said casing, one gearbeing attached to the casing and the other free to revolve therein,independent shafts projecting from op osite ends of the casing, arotating and revo ving beveled gear- Wheel engaging said first-namedgears, substantially as described.

2. The combination With a tachometer, of

a'detachable casing, shafts carried by the 45 means for changing therate of motion of the tachometer accordingly as one or the other of saidshafts is connected With the tachometer.

3. An .attachment for tachometers, comprising a detachable andreversible casing, tWo revoluble shafts journaled in said casing andprojecting respectively from opposite ends of the casing and meanscarried Within saidv casing for imparting motion from one of said shaftsto the other of said shafts, said means being adapted to change thespeed of the motion so imparted.

4. The combination With a tachometer, of a casing detachable from andreversible relatively to the tachometer, revoluble shafts carried by-Asaid casing, said shafts being adapted to be alternatively inserted intothe tachometer and connected with the mechanism thereof, means mountedWithin said casing for communicating motion from one of the shaftstherein to the other of said shafts, said last named means being adaptedto change the speed of the motion so communicated and thereby increaseor decrease the rate of motion of the tachometer mechanism, accordinglyas one or the other of saidlshafts is connected with the tachometer.

In testimony Whereof I afliX my signature in the presence of tWoWitnesses.

ANTHONY FRIOKER.

Witnesses:

E. E. POTTER, M. E. LAWSON.

